Crossword Genius

___ fly (R.B.I.-earning play) (3)

Ross

I believe the answer is:

sac

(Other definitions for sac that I've seen before include "Bladder" , "Pouch in the body" , "Bag-like part in animal or plant" , "Pouch or bag-like structure" , "Bodily cavity enclosed by a membrane" .)

I've seen this clue in The New York Times.
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